mirror of
https://github.com/rclone/rclone.git
synced 2024-11-23 08:54:10 +01:00
266 lines
6.5 KiB
Go
266 lines
6.5 KiB
Go
package ftp
|
||
|
||
import (
|
||
"errors"
|
||
"fmt"
|
||
"strconv"
|
||
"strings"
|
||
"time"
|
||
)
|
||
|
||
var errUnsupportedListLine = errors.New("unsupported LIST line")
|
||
var errUnsupportedListDate = errors.New("unsupported LIST date")
|
||
var errUnknownListEntryType = errors.New("unknown entry type")
|
||
|
||
type parseFunc func(string, time.Time, *time.Location) (*Entry, error)
|
||
|
||
var listLineParsers = []parseFunc{
|
||
parseRFC3659ListLine,
|
||
parseLsListLine,
|
||
parseDirListLine,
|
||
parseHostedFTPLine,
|
||
}
|
||
|
||
var dirTimeFormats = []string{
|
||
"01-02-06 03:04PM",
|
||
"2006-01-02 15:04",
|
||
}
|
||
|
||
// parseRFC3659ListLine parses the style of directory line defined in RFC 3659.
|
||
func parseRFC3659ListLine(line string, now time.Time, loc *time.Location) (*Entry, error) {
|
||
iSemicolon := strings.Index(line, ";")
|
||
iWhitespace := strings.Index(line, " ")
|
||
|
||
if iSemicolon < 0 || iSemicolon > iWhitespace {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
e := &Entry{
|
||
Name: line[iWhitespace+1:],
|
||
}
|
||
|
||
for _, field := range strings.Split(line[:iWhitespace-1], ";") {
|
||
i := strings.Index(field, "=")
|
||
if i < 1 {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
key := strings.ToLower(field[:i])
|
||
value := field[i+1:]
|
||
|
||
switch key {
|
||
case "modify":
|
||
var err error
|
||
e.Time, err = time.ParseInLocation("20060102150405", value, loc)
|
||
if err != nil {
|
||
return nil, err
|
||
}
|
||
case "type":
|
||
switch value {
|
||
case "dir", "cdir", "pdir":
|
||
e.Type = EntryTypeFolder
|
||
case "file":
|
||
e.Type = EntryTypeFile
|
||
}
|
||
case "size":
|
||
e.setSize(value)
|
||
}
|
||
}
|
||
return e, nil
|
||
}
|
||
|
||
// parseLsListLine parses a directory line in a format based on the output of
|
||
// the UNIX ls command.
|
||
func parseLsListLine(line string, now time.Time, loc *time.Location) (*Entry, error) {
|
||
|
||
// Has the first field a length of exactly 10 bytes
|
||
// - or 10 bytes with an additional '+' character for indicating ACLs?
|
||
// If not, return.
|
||
if i := strings.IndexByte(line, ' '); !(i == 10 || (i == 11 && line[10] == '+')) {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
scanner := newScanner(line)
|
||
fields := scanner.NextFields(6)
|
||
|
||
if len(fields) < 6 {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
if fields[1] == "folder" && fields[2] == "0" {
|
||
e := &Entry{
|
||
Type: EntryTypeFolder,
|
||
Name: scanner.Remaining(),
|
||
}
|
||
if err := e.setTime(fields[3:6], now, loc); err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
return e, nil
|
||
}
|
||
|
||
if fields[1] == "0" {
|
||
fields = append(fields, scanner.Next())
|
||
e := &Entry{
|
||
Type: EntryTypeFile,
|
||
Name: scanner.Remaining(),
|
||
}
|
||
|
||
if err := e.setSize(fields[2]); err != nil {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
if err := e.setTime(fields[4:7], now, loc); err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
return e, nil
|
||
}
|
||
|
||
// Read two more fields
|
||
fields = append(fields, scanner.NextFields(2)...)
|
||
if len(fields) < 8 {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
e := &Entry{
|
||
Name: scanner.Remaining(),
|
||
}
|
||
switch fields[0][0] {
|
||
case '-':
|
||
e.Type = EntryTypeFile
|
||
if err := e.setSize(fields[4]); err != nil {
|
||
return nil, err
|
||
}
|
||
case 'd':
|
||
e.Type = EntryTypeFolder
|
||
case 'l':
|
||
e.Type = EntryTypeLink
|
||
|
||
// Split link name and target
|
||
if i := strings.Index(e.Name, " -> "); i > 0 {
|
||
e.Target = e.Name[i+4:]
|
||
e.Name = e.Name[:i]
|
||
}
|
||
default:
|
||
return nil, errUnknownListEntryType
|
||
}
|
||
|
||
if err := e.setTime(fields[5:8], now, loc); err != nil {
|
||
return nil, err
|
||
}
|
||
|
||
return e, nil
|
||
}
|
||
|
||
// parseDirListLine parses a directory line in a format based on the output of
|
||
// the MS-DOS DIR command.
|
||
func parseDirListLine(line string, now time.Time, loc *time.Location) (*Entry, error) {
|
||
e := &Entry{}
|
||
var err error
|
||
|
||
// Try various time formats that DIR might use, and stop when one works.
|
||
for _, format := range dirTimeFormats {
|
||
if len(line) > len(format) {
|
||
e.Time, err = time.ParseInLocation(format, line[:len(format)], loc)
|
||
if err == nil {
|
||
line = line[len(format):]
|
||
break
|
||
}
|
||
}
|
||
}
|
||
if err != nil {
|
||
// None of the time formats worked.
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
line = strings.TrimLeft(line, " ")
|
||
if strings.HasPrefix(line, "<DIR>") {
|
||
e.Type = EntryTypeFolder
|
||
line = strings.TrimPrefix(line, "<DIR>")
|
||
} else {
|
||
space := strings.Index(line, " ")
|
||
if space == -1 {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
e.Size, err = strconv.ParseUint(line[:space], 10, 64)
|
||
if err != nil {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
e.Type = EntryTypeFile
|
||
line = line[space:]
|
||
}
|
||
|
||
e.Name = strings.TrimLeft(line, " ")
|
||
return e, nil
|
||
}
|
||
|
||
// parseHostedFTPLine parses a directory line in the non-standard format used
|
||
// by hostedftp.com
|
||
// -r-------- 0 user group 65222236 Feb 24 00:39 UABlacklistingWeek8.csv
|
||
// (The link count is inexplicably 0)
|
||
func parseHostedFTPLine(line string, now time.Time, loc *time.Location) (*Entry, error) {
|
||
// Has the first field a length of 10 bytes?
|
||
if strings.IndexByte(line, ' ') != 10 {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
scanner := newScanner(line)
|
||
fields := scanner.NextFields(2)
|
||
|
||
if len(fields) < 2 || fields[1] != "0" {
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
// Set link count to 1 and attempt to parse as Unix.
|
||
return parseLsListLine(fields[0]+" 1 "+scanner.Remaining(), now, loc)
|
||
}
|
||
|
||
// parseListLine parses the various non-standard format returned by the LIST
|
||
// FTP command.
|
||
func parseListLine(line string, now time.Time, loc *time.Location) (*Entry, error) {
|
||
for _, f := range listLineParsers {
|
||
e, err := f(line, now, loc)
|
||
if err != errUnsupportedListLine {
|
||
return e, err
|
||
}
|
||
}
|
||
return nil, errUnsupportedListLine
|
||
}
|
||
|
||
func (e *Entry) setSize(str string) (err error) {
|
||
e.Size, err = strconv.ParseUint(str, 0, 64)
|
||
return
|
||
}
|
||
|
||
func (e *Entry) setTime(fields []string, now time.Time, loc *time.Location) (err error) {
|
||
if strings.Contains(fields[2], ":") { // contains time
|
||
thisYear, _, _ := now.Date()
|
||
timeStr := fmt.Sprintf("%s %s %d %s", fields[1], fields[0], thisYear, fields[2])
|
||
e.Time, err = time.ParseInLocation("_2 Jan 2006 15:04", timeStr, loc)
|
||
|
||
/*
|
||
On unix, `info ls` shows:
|
||
|
||
10.1.6 Formatting file timestamps
|
||
---------------------------------
|
||
|
||
A timestamp is considered to be “recent” if it is less than six
|
||
months old, and is not dated in the future. If a timestamp dated today
|
||
is not listed in recent form, the timestamp is in the future, which
|
||
means you probably have clock skew problems which may break programs
|
||
like ‘make’ that rely on file timestamps.
|
||
*/
|
||
if !e.Time.Before(now.AddDate(0, 6, 0)) {
|
||
e.Time = e.Time.AddDate(-1, 0, 0)
|
||
}
|
||
|
||
} else { // only the date
|
||
if len(fields[2]) != 4 {
|
||
return errUnsupportedListDate
|
||
}
|
||
timeStr := fmt.Sprintf("%s %s %s 00:00", fields[1], fields[0], fields[2])
|
||
e.Time, err = time.ParseInLocation("_2 Jan 2006 15:04", timeStr, loc)
|
||
}
|
||
return
|
||
}
|